• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
TheScriptan

How to handle this problem

5 posts in this topic

For example I have this code:

Console.Write("Write Your First Number: ");
                num1 = int.Parse(Console.ReadLine()); // If i write here 6/2 or just s,y program frozes and exits. How To Handle that?
                Console.Write("Write Your Operand: ");
                operand = Console.ReadLine(); // If i write here 6/2 or just s,y program frozes and exits. How To handle that
                Console.Write("Write Your Second Number: ");
                num2 = int.Parse(Console.ReadLine()); // If i write here 6/2 or just s,y program frozes and exits. How To Handle That?
                switch (operand) 
                {
                    case "+":
                        answer = num1 + num2;
                        break;
                    case "-":
                        answer = num1 - num2;
                        break;
                    case "*":
                        answer = num1 * num2;
                        break;
                    case "/":
                        answer = num1 / num2;
                        break;
                    default:
                        Console.Clear();
                        Console.WriteLine("You entered wrong operand. Press Any Key To Continue...");
                        Console.ReadLine();
                        Console.Clear();
                        Calc();
                        break;
                }

How can i handle this if switch default is not working? It's just frozes. I just want to make Console.WriteLine("You entered wrong key, try again");

0

Share this post


Link to post
Share on other sites

It's generally a better idea to use int.TryParse(...) to parse numbers. That function returns false if the parse fails so you can take appropriate action. Only use int.Parse() if you can guarantee that the operation will succeed. In the case of user input, program defensively by using TryParse.

1

Share this post


Link to post
Share on other sites
There are parsers, i.e. lex and yacc that would help you to create proper parser, but if you want to do it from scratch, all by yourself, then go ahead.

Instead of doing it step by step / token by token, allow user to type if entire formula, i.e. 5+5/2
Then tokenize entered text, by splitting it into functional entities, and verify its structure, rejecting when suspicious.
i.e.
1. 5
2. +
3. 5
4. /
5. 2
(if you want to handle proper operation order, like *, /, +, -, then make sure that you order entities properly. RPN is the best choice of notation, which orders entities in a simple stack format)
then do the operations in the proper order, between the entities.
i.e.
3,4,5: 5 / 2 => 2.5 and gives:
1. 5
2. +
3. 2.5
... etc Edited by Mercile55
0

Share this post


Link to post
Share on other sites

I would make a loop so that the program continues. Also, if you make functions that will continue to ask for input until the input is valid, you don't really need a default

 

class Program
{
    static int GetOperand(string title)
    {
        int operand;
        while (true)
        {                
            Console.Write(title + "\n> ");
            if (int.TryParse(Console.ReadLine(), out operand))                
                break;                
            else Console.WriteLine("Invalid input. Try again");
        }
        return operand;
    }

    static string GetOperator(string title)
    {
        string op;
        while (true)
        {
            Console.Write(title + "\n> ");
            op = Console.ReadLine();
            if (op == "+" || op == "-" || op == "*" || op == "/")
                break;
            else Console.WriteLine("Invalid input. Try again");
        }
        return op;
    }

    static void Main(string[] args)
    {
        int num1, num2, answer=0;
        string op;
        while (true)
        {
            num1 = GetOperand("Write Your First Number");                                
            op = GetOperator("Write Your Operand");
            num2 = GetOperand("Write Your Second Number");                                
            switch (op)
            {
                case "+":
                    answer = num1 + num2;
                    break;
                case "-":
                    answer = num1 - num2;
                    break;
                case "*":
                    answer = num1 * num2;
                    break;
                case "/":
                    answer = num1 / num2;
                    break;                    
            }
            Console.WriteLine("Answer is " + answer.ToString());
        }
    }
}

 

 

edit: Don't forget to check for division by zero. If the denominator is zero, your program will crash

edit2: For a more flexible design, search for "reverse polish notation", as Mercile55 mentioned

Edited by pulpfist
0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0